Cruisin' on my Bluebird
Put in an 12 volt LED bulb and and run it off of a 9 volt battery inside the shell. Works well and I've done it several times. You can also add an LED flasher unit from AliExpress, which I've also done.
I guess I could just do a Google, couldn't I.
I bought these for a similar project I'm working on....It's really simple- use a new two wire socket, run the wiring through the original switch (if it still works) and you are there. the original system used the bike frame for the ground connection so you have to isolate that.
9 V Battery Clip Connector